Finding the Fourth Proportional to 2,493.72, 3,740.31 and 644.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,493.72 : 3,740.31 = 644.79 : x
2. Step 2: Convert to fraction form
   2,493.72/3,740.31 = 644.79/x
3. Step 3: Cross multiply
   2,493.72x = 3,740.31 × 644.79
4. Step 4: Simplify right side
   2,493.72x = 2,411,714.48
5. Step 5: Solve for x
   x = 2,411,714.48/2,493.72
6. Step 6: Final answer
   x = 967.12